Typewriting machine



y 1931. s. L. WALSOE 1,803,517

TYPEWRITING MACHINE Fi led Sept. 19,1929 Sheets-Sheet 1 INVENTOR J. WM 5%46? ATTOH N EY 2 Sheets-Sheet 2 Filed Sept. 19, 1929 WlTNESSES Mm m m ATTO R NEY Patented May 5, 1931 Miran srarfss rarest orrics SIGURD L. VTALSOE, OF SPBINGDALE, CGISTNECTIG'UT, ASSTGNOR TO REMINGTON TYPE- W'RITER COMPANY, 033 T111031, NEW YGEELE, .fl CQRPOEATION OF NEW YORK TYPEWRITING MACHINE Application filed september 19, 1929.: Serial No. 393,786.

highly efiicient in operation.

A further object of my invention is to .pro-. vide means of the character specified which may lie-readily applied as an attachment to existing machines without modifying, or material y modifying, the existing structural features thereof. a

V "A still further object of my invention is to provide means of thecharacter referred to which are applicable to andinay be efliciently employed in connection with tabulating mechanism including column stops located at letter space intervals and which are individually shiftable to and from operative 'POSi': tion and in which a plurality of denominational stops areused for cooperation with" said column stops.

To the above andother ends which will hereinafter appear my invention consists in the features of construction,arrangement of parts and combinations of devices set forth in the following description and particularly pointed out in the appended claims.

in the accompanying drawings, wherein like reference characters indicate correspond ing parts in the different views; 7

Fig. l is a fragmentary, detail side 'elevation, with parts in section, disclosing a part of a typewriting machine equipped with the devices of my invention.

Fig. 2 is a fragmentary front elevation of the s ne, with parts broken away and in sectlOIl. i I J i Fig. 3 is an enlarged, detail, perspective View of the attachmentincluding the devices of my invention, said attachment being shown removed from the machine.

' Figs. 4, 5, 6 and 7 are enlarged, detail, perspective views of the different devices that go to make up the attachment of my invention.

My invention isin the nature of an improvement on the construction disclosed in the patent to George A. Seib No. 1,689,058 dated October 23, 1928; V

' The present invention is shown embodied in a No. 20 Remington typewriting machine, so much of the tabulating mechanism as is shown in the accompanying drawings being the same as that ordinarily employed in said machine. Such mechanism is as follows The frame'of the machine comprises corner posts 1 a top plate 2 on which fixed guide rails are mounted, one of which is indicated at 3. The usual carriage 4 has front and rear guide rails, the latter being indicated at 5. Crossed anti-friction rollers 6 are interposed between the guide rails 3 and and the corresponding guide rails (not shown) atthe front of the carriage tosupportthe latter inits travel from side-to-side of the machine over the top plate. 3

I The carriage is impelled in the directio of its feed by the usual spring drum (not shown) under the control of the carriage escapement mechanism. The latter includes a feed rack 7 mounted on a frame 8 pivoted at 9 to the rear'cross bar or rail" 5 of the carriage. Thet'eeth of the feed rack mesh with a feed pinion 10 operatively connected in the usual manner to an escapement wheel 11 which is controlled by the usual feed dogs, (not shown) to afltord'the step-by-step letterspace advance of the carriage'a-t the actuation of the printing keys.

The tabulator mechanism proper is-the same as that ordinarily employed in said machine and includes bracket arms 12 each secured at its forward end to the. carriage and atits rear end to a column stop bar 13'. This bar is provided substantially throughout its length with interdental spaces 14 separated at letter-space intervals and having ineach of them a'bifurcated sheet metal column stop 15 adapted to be shifted forean'd aft of the machine from the inoperative full line position shown in Fig. 1, to the operative position shown in. dotted lines in the same view. A spring detent 16 is attached to each column stop to limit its'rearward movement and hold it against accidental dlsplacement from either of the positions to which it may be shifted.

A key set device is usually employed to ef fect an individual setting of each of the colulnn stops that is to be shifted to operative or effective position, and a wiper is employed to clear such stops or shift them all forward to inoperative position. While these devices have not been shown in the present instance, it should be understood that the embodiment of the devices of the present invention does not interfere with the employment of said key set and wiper devices.

The key controlled denominational stop mechanism which coacts with the column stops shown in part only. Such mechanism comprises tabulator frame 1'? secured to the typewriter frame. Pivoted in the tabulator frame is a series of key actuated denominational stop levers 18, each controlled by a separate key. The upper forwardly eX- tending free end of each of said levers constitutes adenominational stop 19. These stops are separated at letter space intervals and each on the actuation of its key is projected into the path of those column stops which have been shifted to operative position.

In shifting any of the denominational stops to operative position a release of the carriage from control of its escapement mechanism is automatically effected thus enabling the carriage to travel until arrested by the projected denominational stop coacting with the first approaching column stop. The carriage releasing mechanism in the present instance includes the usual means (not shown) by which an actuation of any denominational stop actuates a link 20 pivoted at 21 to a swinging frame 22 pivoted at 23 to a bracket 24 secured to the top plate of the machine. The frame 22 is provided with bearings for a shaft 25 that carries a rack lifting pinion 26 at one end thereof. The opposite end of said shaft carries a carriage retarding device that rotates within a drum 2'? connected to the frame22. On an actuation of a denominational stop the frame 22 is turned on its pivots raising the pinion 26 and throwing it into mesh with the feed rack 7 and lifting said rack out of mesh with r the feed pinion 10. The carriage being thus freed from its escapement mechanism and will travel in the direction of its feed. The travel of the carriage at this time will rotate the shaft 25 and thus control the rate of speed at which the carriage travels.

hen pressure on the key of the actuated denominational stop is released the pinion 26 will swing back to its normal position shown in Fig. 1, thus restoring the carriage to control of its escapement mechanism usually at the selected position determined by the tabulator mechanism. However, it sometimes occurs that the carriage in being arrested by the tabulator mechanism will rebound from its intended position of arrest, especially when the carriage receives a long run before being arrested. It sometimes occurs that the operator will release the actuated tabulator key to permit the feed rack to re-engage the feed pinion 10 while this rebound is taking place. In this event the carriage will not be arrested in the position intended, and this fact not being observed by the operator an entry is eil ected in which the numerals will appear in the wrong denominational positions in the column of figures and the set-up in the adding mechanism, when one is employed, will be erroneous.

One of the objects of my invention is to overcome this diiiiculty and provide efiicient and reliable means for preventing a rebound of the carriage from its positions of arrest by the tahulator mechanism, which means will now he described.

The construction thus far described is the same as that employed in the No. 20 Remington machine and while the devices of my invention may be readily applied as an attaclr ment to said machine, and may be employed in conjunction therewith, without modifying, or materially modifying 'its existing structure, it should be understood that the invention is not restrictedto embodiment in such machines but may be employed in typewriting and like machines generally, wherever found available.

()rdinarily a bracket plate is employed in the machines referred to, which is connected to the top of the tahnlatorframe and has a downwardly and r'earwardly bent end that stands just in front of the column stop bar to prevent the latter from being flexed forward when the column stop clearing wiper referred to above is acting on the column stops to clear them. Such bracket in the present instance is replaced by the sheet metal bracket 28, shown in detail in Fig. 4.

The bracket 28 has slots 29 that receive the shanks of headed screws 30 received at the threaded ends in tapped openings in the top of the tabulator frame 17. This provides a means for readily attaching the bracket together with the parts carried thereby to the machine as a single unit,and for affording a limited lateral adjustment of the bracket in order that the anti-rebound pawl or device carried by the bracket may properly coact with the column stops, as will presently appear. The bracket 28 has a dependingarm 31 that terminates in a rearwardly extending end portion 32 to coact with the column stop bar for the same purpose as the arm usually employed and which has been hereinbefore referred to.

In addition the bracket carries an anti-rebound pawl or device 33 (shown in detail in Fig. 5), a holding device or controlling member 34 (shown in detail in Fig. 6) and a sec- 0nd holding device or controlling member 35,

shown in detail in Fig. 7. The bracket 28 is provided with bearings 36 to receive a fixed pivot 37 on which the pawl 33 is mounted be-v tween the arms 38 in which the bearings 36 are provided. a To the left of the pivotal axis of the pawl 33, and in the'top thereof, is a depression 39 in which the depending end of a wire spring 40 is seated to exert its force against the pawl to lower the nose thereof into engagement with the upper edges of the column stops 15. The opposite end of the spring 40 is anchored to the bracket 28 by a headed screw 41.

The two holding devices 34 and 35 coact with the pawl 33 tonormally maintain the engaging nose thereof out of cooperation with the column stops. Iv will first describe the holding device 34 and indicate how it is controlled and how it controls the pawl 33.

A pivot rod 42 is fixed at its ends in bearings 43 provided on the device 34, and said pivot rod receives a bearing in the. bearing openings in ears 44 which extend up from the supporting bracket 28. A coiled spring 45 surrounds the pivot rod 42 and is anchored at one end to the bracket28. The otherend 46 of this spring bears against the front face of the member 34 and exerts its force rearward against the latter. The force of the spring 45 is greater than the force of the spring 40 and is effective to overcome the latter and hold the pawl 33 against the ower of the spring 40 in the elevated or ine ective osition as will presently appear. 'The device 34 is provided with a forwardly projecting arm or finger '47 that overlies a tail or extension 48 on the pawl V 33 and holds the engaging nose of the pawl elevated, it being remembered that the force of the spring 45 is greater thanthat of the spring 40.

A cross bar 49 on the member 34 extends into thepath of the upper ends of all of the denominational stops 19 to be actuated by the projecting of any of'said stops 19 to effective position, without, however, interfering with the projecting of the actuated stop 19 into the path of the column stops 15. The positive movementof the member 34 against the force of its returning spring 45 is effective to raise the arm 47 ofi"the tail of the pawl 33 thereby relieving the pawl fromrthe pressure of the spring 45. At this time. the pawl 33 would be free to be moved by its spring 40 to effective position were it not for the second holding device .35.

However, the latter is effective to holdthe pawl 33 in ineffective PGSIUOD,

pending perforated ears 50 on the controlling member 35 on the bracket. One of the side arms of the member 05 is provided with an arm that terminates in a finger or projection 53 arranged parallel with the finger 7, and like the latter, overlying the tail 48 of the anti-rebound pawl. A contractile returning spring 54 is connected at one end to the member 35 and at the other end to tie bracket 28 and tends to return said member to normal position. The force of the spring 54 is greater than that of the spring 40 and therefore will restrain the pawl 33 against movement to efi'ective position when the member 35 is'in normal position, in the same manner as the holding device 34. The member 35 has its two sidearms unitednby a cross bar 55. lower edge of this cross bar is formed as a The cam comprisingthe oppositely inclined faces position where it will coact only with the top edges of those column stops 15 which are set rearward to operative position, as will be understood from an-1nspect1on of the dotted line showing of the operative column stops disclosed in Fig. 1. The inoperative column stops 15, shown in full lines in Fig. '1, are not effective on the cam 56, 5. It is only on the approach of the next advancing effective column stop 15 to the projected denominational stop 19 that such column stop will be brought into contact with the cam 55, a and lift the member 35 from the full to the dotted line position shown in Fig. 2, the

column stop which has effected the lifting of the member 35 being indicated at r The effect of thus elevating the membcr'o5 is to .carry the finger 53 thereon up from the projection 48 on the pawl 33, thusreleasing the latter and enabling its spring 40 to lower the pawl to effective position where its nose will engage oneof the column stops15 (either an effective or inefiective one) on theright hand against rebound fromthe exact letter space position where it is intended to be arrested by the coacting or engaged tabulator stops 15 and 19. It will be understood that the effect will be substantially the same whether a denominational stop of the highest or lowest order is actuated. In the latter case the holding device will releasethe pawl 33 and permit its spring 40 to force it to efiective position at a slightly earlier period relative to the time of arrest by the tabulator stops than in the former case. However, in this event side thereof and lock-the carriage in and V the pawl will merely click over t.

column stops until the arr the pawl \'\lil be in po l bound 01" the carriage ron in both cases the pawl is not ative position until the a stop to be arrested has projected denoniii'iational From the for .oinp it vii that there are two side ation in eii'ecting or anti-rebound device 33 to ex lO to move it to operative p tor is the projectioi 19 to operative po spring on the pa device still mai operative position. movement of the hold mal position to release the spring from the p tioned op ration a a about by the travel of the column sto) causing tie posimo It will l 1 stood therefore tl tors are involved will not be rendere 0 p912 tutes an important feutur from ce tain aspects there t suits are a taincd thereby ed out.

Remington machines of the character referred to herein are sometimes equipped with automatic return mechanism similar to that disclosed in the #{:1,G63,3?4; dated March 20, 1928. it sometimes occurs that an operator will actuate a tabulator key after making the last entry, to complete he travel of the carriage to the end of the line and throw into operation the electric motor and bring about return of the carriage to the beginning of the line position. Now, in the event that the antirebound device or pawl is thrown into operation by this more actuation of the tabulator key then the anti-rebound device is apt to be effective at the same time as the carriage return mechanism, one op rating to return tie car iage and the other operating to prevent its return movement. ll hen this condition applies the pawl 33 is apt to be held jammed against return to noriral position even after the operator releases the actuated tabulator key. This would result in holding the carriage against return movement while the carriage return motor is attempting to return it, which might result in bu *ning out and destroying the motor.

One of the main objects of my invention is to overcome this defect. It will be understood that a column stop 15 which could coact liar-t Patent with a denominational stop to arrest the carriage at the end of the line is never set in operative position to attain such a result. There would be no object at any time in setting such column stop in ope 'ative position. it "follows, thereto (2, in the present cons that when the carriage reaches the end of a line M12118 will be no operative column stop to coact with the h lding device 35 to elevate it. Consequently the anti-re- )ound device or pawl cannot be released from its i ioperative position at this time and permitted to -function. Therefore, by the s of the present construction no injury to moto 1 result from the causes pointed 1 vhenit is necessary to have ,d dev ce operate it will tune- 2 oni at such times.

1 "a es of the present aovant re pointed out, it will devices readily lend neetion with tabuladisclosed, wherein mecn closely air a." d tional stops are employed, space for the use of antir. devices carried by either set of such certain aspects the steps 15 and 19 J8 regarded as tabulator stops, from aspects as column and denominational ely and from still other s each 1= t1 .4 19 may be regarded as a key controller. counter stop and such terms are variously cingloyed in the claims.

While I have cescribed the invention in detail in one form or embodiment thereof it should understood that various changes may be made in the construction, and some of its feztr res may be employed without others, without departing from my invention as it defined in the accompanying claims.

ll at I claim as new and desire to secure by Letters Patent is:

1. The combination of a -arriage; tabulator mechanism including column stops and a key controlled counter stoj a normally ineilectively anti-rebound device carried by the frame of the ma *hine and cooperative with he column sti ps to p 'event rebound of the carriage when the latter is a rested by said tabulator mechanism; and two independentl lid efi'ective anti-rebound devi e carried by the frame of the machine and cooperative with the column stops to prevent rebound ofthe carriage when the latter is arrested by said tabulator mechanism; and two independently operable controlling devices for affording a movement of said anti-rebound device to operative position, one of said controlling devices being in the path of movement of and controlled bythe counter stop and the other of said controlling devices being in the path of and controlled by anefiective column stop as it approaches the projected counter stop, the successive operations of both of said'controlling devices being necessary to bring about a movement of ;saidantirebound device to operative position.

3. The combination of a carriage;'tabulator mechanism including column stops and a key controlled counter stop; a normally ineffective anti-rebound device carried by the frame of the machine and cooperative with the column stops to prevent rebound of the carriage when the latteris arrested by said tabulator mechanism; and two independently operable controlling devices for afiording a movement of said anti-rebound device to operative position,-one of said controlling clevices'being controlled by the counter stop and the other having a cam operated on by an efiective column stop as itapproaches theprojected counter stop, said cam carrying controlling device being thus shifted to afiord a movement of the anti-rebound device to operative position. 1

4 The combination of a carriage; tabulator mechanism including column stops and a key controlled counter stop; .a' normallyineffective anti-rebound device for preventing rebound of the carriage when the latter is arrested by said tabulator mechanism; a

spring for moving said anti-rebound device to operative position; and controlling meansfor enabling said anti-rebound device to be moved to operative position, said controlling means including a cam acted on by a" column stop as it approaches the actuated counter stop and eflective to release'said anti-rebound device and enable its spring to' move it to operative position.

5. The combination of a carriage; tabulator mechanism including column stops and a key controlled counter stop; a normally inefiective anti-rebound device for preventing rebound of the carriage when the latter is arrested by said tabulator mechanism; a spring for moving said anti-rebounddevice to operative position; and controlling means for enabling said anti-rebound device to be moved to operative position, said controlling means including a cam acted on by a column stop as it approaches the actuated counter.

stop and effective to release said anti-rebound device and enable its spring to move it to operative position, and a holding device con trolled by an actuation-of saidkeycontrolled tive anti-rebound device for preventing rebound of the carriage when the latter is arrested by said tabulator mechanism; a spring for moving said anti-rebound device to operative position; and a springfreturned holding device coacting with the anti rebound device and the force of the spring of which is sufficient to overcome the spring ofsaid antirebound device and hold the latter in inoperative position, said holding device beingpositively acted on by a column stop in its approach to-the projected counter stop and thereby eilect a shifting of the holding device against the force of its spring to release the anti-rebound device.

7; The combination of a carriage; tabulator mechanism including column stops and a key controlled counter stop; a normally ineffective anti-rebound device for preventing rebound of the carriage when the latter'is arrested by said tabulator -mechanism; a spring for moving to operative position a spring returned holding device coacting with the anti-rebound device and the force of the spring of which is sufiicient to overcome the spring of said anti-rebound "device and hold the latter in' inoperative position, said holding device bepositively acted on by a column stop in its approach to the projected counter stop and thereby effect ashifting of the holding device against the force of its spring to release the anti-rebound device; and a second spring returned holding device coacting with the anti-rebound device and the force of the spring of which overcomes the force of the spring of said anti-rebound device, said last mentioned holding device being shifted against the force of its spring byprojecting the counter stop to effective position.

8.. Thecombination of a carriage; tabulator mechanism including column stops and a key controlled counter stop; a normally inetlective anti-rebound device for preventing rebound of the carriage when the latter is arrested'by said tabulat or'mechanism; and

controlling means for enabling said antirebound dev1ce to be moved to operative position, said controlling means comprisingtwo.

independently operable holding devicescooperative with said anti-rebound device, one

of said holding devices bemg under control said anti-rebound device ment of the anti-rebound device to operative position.

9. The combination of a carriage; tabulator mechanism including column stops and a'key controlled counter stop; a normally ineffective anti-rehound device for preventing rebound of the carriage when the latter is arrested bysaid tabulator mechanism; and controlling means for enabling said anti-rebound deviceto he mo'ved'to operative position, saidcontroliing means comprising two independently o iera'ble holding devices 00- operative with said anti-rebound device, one of said holding devices being under control of saidkey actuated counter stop and the other being under control of a column stop in'its approach to theprojected counter stop, it requiring an actuation of both of said holding devices in order to bring about a movement of the anti-rebound device to operative position, a spring for moving the anti-rebound device to operative position, and a spring of greater force for each of saidholdingdevices for returning them to normal position and overcoming the force of thespring for the anti-rebound device.

10. The combination ofa carriage; tabulator mechanism including column stops and a keycontrolled counter stop; a normally ineifectiveanti-rebound device for preventing rebound of the carriage when the latter is arrested by said tabulator mechanism; and controlling means for enabling said antirebound device to be moved to operative position, said controlling means comprising two independently operableand holding devices pivoted on the frame of the machine and coacting with said anti-rebound device, one-of said holding devices extending into the pathrot the key actuated counter stop to be actuated thereby and the other holding device having a cam that is acted on by a column stop advancing to coact with the projected counter stop and thus effect an actuation of the associated holding device.

11. The combination of a carriage; tabulator mechanism including column stops and a key controlled counter stop; a normally ineffective anti-rebound device'for preventing rebound of the carriage when the latter is arrested by said tabulator mechanism; and controlling means for=enabl1ng said anti-rebound device t o'be moved to operative position, said controlling means comprising two independentlyoperable holding devices pivoted ontheframeofthe machine and coacting with said-anti-rebound device, one of said holding devices extending into'thepath of thekey actuated counter stop to beactuated rthereby and the other holding device having ';a cam that is acted on bya column-stop advancing to coact'withthelprojecte'd counter stop-and thusefiect an actuation of the associa-tedholding device,a spring for moving said antnrebound devlce to operative position, and a stronger spring for returning each of said holding devices to normal position, thereby overcoming the force of the spring for the anti-rebound device and releasing the latter only by an actuation of both of said holding devices as specified.

12. The combination of a carriage; tabulator mechanism including a series of column stops and a series of key controlled denominational stops; a normally ineffective anti-rebound device cooperative with said column stops to prevent rebound of the carriage when the latter is arrested by said tabulator mechanism; and means for rendering said anti-rebound device efiective comprising a holding member coacting with said antirebound device for holding it'in ineffective position, and a cam carried by said holding member and of an extent slightly greater in length thanthe width of the series of denominational stops and with which a column stop advancing to the position of arrest by a projected denominational stop coa'cts to move said holding member and thereby release the anti-rebound device.

13. The combination of a carriage; tabula tor mechanism including a series of column stops and a series of key controlled denominational stops; a normally ineffective antirebound device cooperative with said column stops to prevent rebound of the carriage when the latter is arrested by said tabulator mechanism; and means for rendering said antirebound deviceeitective comprisin'ga holding member coacting with said anti-rebound device for holding it in ineffective position, a cam carried by said holding member and of an extent that is slightly'greater in length thanwidth ofthe series of denominational stops and with which acolumn stop advancing to the position of arrest by a projected denominational stop coacts to move said hoidin member and thereby release the antirebound device, and a-second holding member coacting with said anti-rebounddevice to hold it in ineffective position and having a portion thereof that is in the path of all of said denominationalstops to be actuated by an operation of any of them and when actuated release the anti-rebound nevice, an actuation of both holding members being required tonfford a movement of said anti-rebound "devi co to efiective position.

an extent that is slightly greater in length than the width of the series of denominational stops and with which a column stop advancing to the position of arrest by a pro jected denominational stop coacts to move said holding member and thereby release the anti-rebound device, a second holding member coactiug with said anti-rebound device to hold it in ineffective position and having a portion thereof that is in the path of all of said denominational stops to be actuated by an operation of anyv of them and when actuated release the anti-rebound device, an actuation of both holding members being required to afford a movement of said anti-rebound device to effective position, a spring for moving said anti-rebound device to effective position, and a spring of greater force for each of saic holding members for returning them to normal position and overcoming the 'force of the spring for the anti-rebound device.

15. The combination of a carriage; tabulator mechanism including a series of column stops mounted on the carriage at letter space intervals for adjustment to and from operative position and a series of' key controlled denominational stops; an anti-rebound pawl carried by the frame of the machine and cooperative with said column stops/t0 prevent a rebound of the carriagewhen it is arrested by said tabulator mechanism; and means for controlling the movement of said anti-rebound pawl into and out of cooperative relation with said column stops, said controlling means including a cam-carrying holding member cooperative with said pawl, the cam on said holding member being acted on only by those column stops which are adjusted to operative position in order to afford a movement of said pawl to operative position;

16. The combination of a carriage; tabulator mechanism includingaseries of column stops mounted on the carriage at letter space intervals for adjustment to-and from operative position and a series of key controlled denominational stops; an anti-rebound pawl carried by the frame of the machine and cooperativewith said column stops to prevent a rebound of the carriage when it is arrested by said tabulator mechanism; and means for controlling the movement of said anti-rebound pawl into and out of cooperative relation with said column stops, said controlling means including a cam-carrying holding member cooperative with said pawl, the cam on said holding member being acted on only by those column stops which are adjusted to operative position in order to afford a movement of said pawl to operative position, a spring which tends to move said anti-rebound pawl to operative position, and a returning spring of greater force for returning said controlling member to normal position and for moving said pawl to inoperative position against the force of its spring.

I 17. The combination of a carriage; tabulato'r mechanism including a series of column stops mounted on the carriage at letter space intervals for adjustment to and from operative position and a series of key controlled denominational stops; an anti-rebound pawl carried by the frame of the machine and cooperative with said column stops'to prevent a rebound of the carriage when it is arrested by said tabulator mechanism; and means for controlling the movement of said anti-rebound pawl into and out of cooperativerelation with said column stops, said controlling means including a cam-carrying holding member cooperative with said pawl, the cam on said holding member being acted on only by those column stops which are adjusted to operative position in order to afford a movement of said pawl to operative position, and

a second holding member cooperative with said pawl and controlled in its movement by themovement into and out of effective position of any one of said denominational stops, it requiring the actuation of both of said holding members to afford a movement of said pawl to operative position.

18. The combination of a carriage; tabulator mechanism including a series of column stops mounted on the carriage at letter space intervals for adjustment to and from opera tive position and a series of key controlled denominational stops; an anti-rebound pawl carried by the frame of the machlne and cooperative with said column stops to pre vent a rebound of the carriage when it is arrested by said tabulator mechanism: and means for controlling the movement of said anti-rebound pawl into and out of cooperative relation with said column stops, said controlling means including a cam-carrying holding member cooperative with said pawl, the cam'on said holding member being acted on only by those column stops which are adjusted to operative position in order to afford a movement of said pawl to operative position,a second holding member cooperative.

with said pawland controlled in its movement bv the movement into and out ofetfective position of any one of said denominational stops, it 'requirin the actuation of both of said holding members to afford a movement of said pawl to operative position, a spring which tends to move said anti-rebound pawl to operative position, a returning spring of greater force for each of said holding members and each of which in returning its holding member to normal position moves the pawl to inoperative position against the force ofit-s sprin Signed at Stamford, in the county of Fair field and State of Connecticut, this 18th day of September A. D. 1929.

SIGURD L. WALSOE. 

